E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/17
E21B 33/14 (2006.01)
Patent
CA 1283039
ABSTRACT OF THE DISCLOSURE A novel method and device for manipulating ferrofluids for use in cementing wells are disclosed. The cementitious fluids may comprise: (a) a hydraulic cement, (b) finely divided magnetic particles, (c) a binding agent of a surfac- tant, and (d) a liquid medium. The binding agent or surfac- tant is present in the compositions in an amount sufficient to render the compositions stable in a magnetic field. When used in cementing wells, the cementitious ferrofluids are implaced in the annulus separating a casing from the forma- tion in a wellbore by conventional techniques and the slurry is subsequently subjected to an activating alternating magnetic field that causes movement of the slurry. The non- cementitious ferrofluids comprise: (a) finely divided magnetic particles, (b) stabilizing agent, and (c) a liquid medium. The movement of the slurry results in a "scrubbing" action against the surface of the casing and formation surfaces, and a mixing of the slurry which helps displace any residual drilling mud. The net result is better bonding of the cement to the casing and formation.
549599
Larson David Bryan
Nelson Erik Bentley
Dowell Schlumberger Canada Inc.
Smart & Biggar
LandOfFree
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